Description

The unctrl() macro expands to a character string which is a printable
representation of the character c. Control characters are displayed in the ^X
notation. Printing characters are displayed as is.

With the keyname() routine, a character string corresponding to the key c
is returned.

The filter() routine, if used, is called before initscr() or newterm() are
called. It makes curses think that there is a one-line screen. curses
does not use any terminal capabilities that assume that they know on what
line of the screen the cursor is positioned.

The use_env() routine, if used, is called before initscr() or newterm() are
called. When called with FALSE as an argument, the values of lines
and columns specified in the terminfo database will be used, even if environment
variables LINES and COLUMNS (used by default) are set, or if curses
is running in a window (in which case default behavior would be to
use the window size if LINES and COLUMNS are not set).

With the putwin() routine, all data associated with window win is written
into the file to which filep points. This information can be later
retrieved using the getwin() function.

The getwin() routine reads window related data stored in the file by
putwin(). The routine then creates and initializes a new window using that
data. It returns a pointer to the new window.

The delay_output() routine inserts an ms millisecond pause in output. This routine
should not be used extensively because padding characters are used rather than
a CPU pause.

The flushinp() routine throws away any typeahead that has been typed by
the user and has not yet been read by the program.

Return Values

Except for flushinp(), routines that return an integer return ERR upon failure
and an integer value other than ERR upon successful completion.